sterol vs cholesterin

sterol and cholesterin both are nouns.

Word	Noun	Adjective	Verb	Adverb
sterol	Yes	No	No	No
cholesterin	Yes	No	No	No

As nouns, cholesterin is a hyponym of sterol; that is, cholesterin is a word with a more specific, narrower meaning than sterol:

sterol: any of a group of natural steroid alcohols derived from plants or animals; they are waxy insoluble substances
cholesterin: an animal sterol that is normally synthesized by the liver; the most abundant steroid in animal tissues

Other hyponyms of sterol include cholesterol, ergosterol, mycosterol.

sterol (noun)	cholesterin (noun)
any of a group of natural steroid alcohols derived from plants or animals; they are waxy insoluble substances	an animal sterol that is normally synthesized by the liver; the most abundant steroid in animal tissues